Abstract
Flow pattern, presure drop and heat transfer are investigated for R113 boiling two-phase flow in extremely narrow channels with a thickness of 35-110μm between horizontal parallel plates. It is clarified from the exeriments that the friction multiplier of two-phase flow is well estimated by the empirical correlation proposed for adiabatic systems, and that the heat transfer coefficient of two-phase flow is 3-20 times as large as that of the liquid single-phase flow. An analytical model based on viscous flow and the effect of the capillary number on the thickness of the liquid film is proposed. It provides an explanation for the frictional pressure drop and the heat transfer coefficient.
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